US7694658B2 - Two-stroke engine, especially for landcraft, watercraft, or aircraft models - Google Patents

Two-stroke engine, especially for landcraft, watercraft, or aircraft models Download PDF

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Publication number
US7694658B2
US7694658B2 US11/994,671 US99467106A US7694658B2 US 7694658 B2 US7694658 B2 US 7694658B2 US 99467106 A US99467106 A US 99467106A US 7694658 B2 US7694658 B2 US 7694658B2
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US
United States
Prior art keywords
cylinder liner
piston
stroke engine
crankshaft
slot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
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US11/994,671
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English (en)
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US20090020107A1 (en
Inventor
Fabrice Ramella
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Team Orion Europe SA
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Team Orion Europe SA
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Assigned to TEAM ORION EUROPE SA reassignment TEAM ORION EUROPE SA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAMELLA, FABRICE
Publication of US20090020107A1 publication Critical patent/US20090020107A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
    • F02F1/16—Cylinder liners of wet type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/34—Ultra-small engines, e.g. for driving models
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging

Definitions

  • the present invention relates to the field of internal combustion engines. It concerns a two-stroke engine, especially for landcraft, watercraft or aircraft models. Such a two-stroke engine is known, for example from publication EP-A1-0 059 872.
  • Two-stroke engines for aircraft models are usually designed as single-cylinder engines and have a piston which runs in a cylinder and which is connected via a connecting rod to a crankshaft rotatably mounted in a crankcase.
  • the piston is pivotably mounted at the top end of the connecting rod by means of a piston pin.
  • the connecting rod transmits the movement of the piston to a crankshaft.
  • Via the hollow crankshaft a fuel/air mixture is drawn into the crankcase, compressed and delivered via an overflow passage into the combustion chamber.
  • an outlet Arranged opposite the overflow passage is an outlet, through which the combustion gases are forced outward.
  • a cylinder liner Inserted into the cylinder is a cylinder liner, which defines the combustion chamber and in which the piston is displaceably mounted.
  • Such a two-stroke engine is disclosed in the publication (FIGS. 1, 5) mentioned at the beginning.
  • the cylinder liner is provided there with the designation 30 and the cylinder with the designation 18.
  • the piston and the cylinder having the inserted cylinder liner, in which the piston runs, are subjected to the heat to a very high degree.
  • the piston, the cylinder and the cylinder liner are still cold and the material has not expanded.
  • the cylinder and the piston expand from the stoppage temperature up to the operating temperature.
  • the operating temperature at the top, in the region of the combustion chamber is higher than the operating temperature in the bottom region of the cylinder, of the cylinder liner and of the piston.
  • the bottom region of the cylinder liner lies in the crankcase, at a distance from the combustion chamber, that is to say at a point which is not so hot.
  • the cylinder liner and the piston are as a rule made of different materials. As a rule, therefore, the materials do not have the same coefficient of thermal expansion.
  • the cylinder having the cylinder liner has a smaller diameter at the top than at the bottom at stoppage temperature; it is therefore conical.
  • the cylinder liner becomes much warmer at the top, in the region of the combustion chamber, than at the bottom, in the region of the crankcase. It therefore expands more at the top than at the bottom.
  • the cylinder liner then becomes virtually cylindrical, i.e. it has the same diameter at the top and bottom.
  • the conical shape of the cylinder liner has the disadvantage that the piston sticks at the top at stoppage temperature. This makes the starting of the engine more difficult. Every time the engine is started, the high friction causes undesirable wear of the piston and of the cylinder liner at the point at which the piston sticks. If the parts are worn, the piston and cylinder liner no longer form a seal. This makes the starting of the engine very difficult.
  • the cylinder liner at the bottom end adjacent to the crankcase, has means which intensify the thermally induced radial expansion of the cylinder liner.
  • the unequal expansion of the cylinder liner at the hot top end and at the comparatively cold bottom end can at least partly be compensated for.
  • the cylinder liner can have, at the bottom end, at least one slot running in the axial direction.
  • the cylinder liner can have, distributed over the circumference, a plurality of slots running in the axial direction, and, in particular, four slots arranged offset in each case by 90°.
  • the cylinder liner in the region of the slots, may be provided with a respective bevel in such a way that the wall thickness of the cylinder liner is reduced toward the bottom.
  • the cylinder liner can narrow slightly conically toward the top.
  • FIG. 1 shows, in a perspective side view, an exemplary embodiment of a cylinder liner according to the invention, having four slots in beveled surfaces at the bottom margin of the cylinder liner;
  • FIG. 2 shows the cylinder liner from FIG. 1 in a perspective sectional view.
  • FIGS. 1 and 2 A cylinder liner for a two-stroke engine according to a preferred exemplary embodiment of the invention is reproduced in FIGS. 1 and 2 .
  • the cylinder liner 10 has an essentially circular-cylindrical shape, but may taper slightly conically towards the top.
  • the cylinder liner is inserted into a cylinder, as shown by way of example in the publication mentioned at the beginning.
  • the cylinder liner 10 has a plurality of openings 17 , 18 which are arranged at the circumference in a distributed manner and serve to feed the fresh gas and to discharge the combustion gases.
  • the cylinder liner 10 encloses a cylinder space 11 in which the piston (not shown) is mounted in a sliding, displaceable manner.
  • the piston slides along the cylinder liner wall 12 in the process.
  • the piston and the cylinder liner 10 expand differently.
  • temperature differences arise between the (hotter) top part of the cylinder liner 10 and the (colder) bottom part.
  • the novel cylinder liner is cut open at the bottom at least once in the axial direction, such that the bottom cylinder liner part can fan out in a petaled manner.
  • four slots 15 , 16 are arranged at the circumference in a distributed manner, said slots 15 , 16 being offset in each case by 90°. Of the four slots, only two front slots can be seen.
  • the narrow slots 15 , 16 end below the openings 17 , 18 .
  • the expansion of the bottom parts of the cylinder liner 10 is influenced by the temperature. It should be noted in particular that the inner bottom hotter part of the cylinder liner 10 is hotter than the outer bottom part of the cylinder liner. On the inside, friction, inter alia, occurs due to the piston and due to heating by the hot combustion gases. On the outside, the cylinder liner parts are cooled by the colder and cooling engine housing, by the cold fresh gas mixture, etc. The result is outward deformation of the bottom cylinder liner parts.
  • the conicity of the cylinder liner 10 can be kept small, the seal between piston and cylinder is improved, the friction is reduced, the sticking in the top part is removed or at least reduced, and the wear is reduced.
  • the starting of the engine is facilitated.
  • the engine gains in power and in acceleration response.
  • the cylinder liner 10 may be provided with milled bevels 13 , 14 in the region of the slots in order to intensify the expansion effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US11/994,671 2005-07-06 2006-06-22 Two-stroke engine, especially for landcraft, watercraft, or aircraft models Expired - Fee Related US7694658B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH1128/05 2005-07-06
CH01128/05 2005-07-06
CH11282005 2005-07-06
PCT/CH2006/000336 WO2007003064A1 (de) 2005-07-06 2006-06-22 Zweitaktmotor, insbesondere für modelle von land-, wasser oder luftfahrzeugen

Publications (2)

Publication Number Publication Date
US20090020107A1 US20090020107A1 (en) 2009-01-22
US7694658B2 true US7694658B2 (en) 2010-04-13

Family

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US11/994,671 Expired - Fee Related US7694658B2 (en) 2005-07-06 2006-06-22 Two-stroke engine, especially for landcraft, watercraft, or aircraft models

Country Status (4)

Country Link
US (1) US7694658B2 (ja)
EP (1) EP1899592A1 (ja)
JP (1) JP4913135B2 (ja)
WO (1) WO2007003064A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110146643A1 (en) * 2009-12-19 2011-06-23 Andreas Stihl Ag & Co. Kg Two-Stroke Engine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8389977B2 (en) * 2009-12-10 2013-03-05 Transphorm Inc. Reverse side engineered III-nitride devices
JP7124446B2 (ja) * 2018-05-25 2022-08-24 スズキ株式会社 エンジン
DE102018122322A1 (de) * 2018-09-13 2020-03-19 Man Energy Solutions Se Zylinderlaufbuchse und Brennkraftmaschine
US20240159198A1 (en) * 2022-08-24 2024-05-16 Cummins Inc. Cylinder Liner for Internal Combustion Engine and Method for Installing the Same

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB238933A (en) 1924-05-26 1925-08-26 Percy St George Kirke Improvements in internal combustion engines
JPS578333A (en) * 1980-06-18 1982-01-16 Sanshin Ind Co Ltd Crank chamber precompression type 2 cycle internal combustion engine
JPS5776364A (en) 1980-10-28 1982-05-13 Yamaha Motor Co Ltd Cylinder block integrated with cylinder head
EP0059872A1 (de) 1981-03-06 1982-09-15 Helmut Bernhardt GmbH u. Co. KG Feinmechanik Modellmotor
JPS6128741A (ja) 1984-07-19 1986-02-08 Nissan Motor Co Ltd シリンダライナの断熱構造
FR2597924A1 (fr) 1986-04-28 1987-10-30 Thaelmann Fahrzeug Jagdwaffen Conduit d'echappement comportant une disposition et une conformation speciale pour moteur a deux temps
JPS63131848A (ja) 1986-11-20 1988-06-03 Takara Co Ltd 玩具用エンジンシリンダの内面処理方法
DE4116652C1 (ja) 1991-05-22 1992-06-25 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart, De
US20060112924A1 (en) 2002-08-24 2006-06-01 Helmut Schaefer Cylinder liner for a cylinder crankcase

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3907099C1 (ja) * 1989-03-04 1989-11-16 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart, De
JPH09324694A (ja) * 1996-06-06 1997-12-16 Toyota Motor Corp 多気筒シリンダブロック
SE514243C2 (sv) * 1998-06-09 2001-01-29 Flow Holdings Gmbh Sagl Llc Förfarande för att åstadkomma en högtryckspress samt högtryckspress
JP4609348B2 (ja) * 2006-03-07 2011-01-12 日産自動車株式会社 鋳込みスリーブ構造およびその製造方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB238933A (en) 1924-05-26 1925-08-26 Percy St George Kirke Improvements in internal combustion engines
JPS578333A (en) * 1980-06-18 1982-01-16 Sanshin Ind Co Ltd Crank chamber precompression type 2 cycle internal combustion engine
JPS5776364A (en) 1980-10-28 1982-05-13 Yamaha Motor Co Ltd Cylinder block integrated with cylinder head
EP0059872A1 (de) 1981-03-06 1982-09-15 Helmut Bernhardt GmbH u. Co. KG Feinmechanik Modellmotor
JPS6128741A (ja) 1984-07-19 1986-02-08 Nissan Motor Co Ltd シリンダライナの断熱構造
FR2597924A1 (fr) 1986-04-28 1987-10-30 Thaelmann Fahrzeug Jagdwaffen Conduit d'echappement comportant une disposition et une conformation speciale pour moteur a deux temps
JPS63131848A (ja) 1986-11-20 1988-06-03 Takara Co Ltd 玩具用エンジンシリンダの内面処理方法
DE4116652C1 (ja) 1991-05-22 1992-06-25 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart, De
US20060112924A1 (en) 2002-08-24 2006-06-01 Helmut Schaefer Cylinder liner for a cylinder crankcase

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110146643A1 (en) * 2009-12-19 2011-06-23 Andreas Stihl Ag & Co. Kg Two-Stroke Engine

Also Published As

Publication number Publication date
EP1899592A1 (de) 2008-03-19
WO2007003064A1 (de) 2007-01-11
JP4913135B2 (ja) 2012-04-11
US20090020107A1 (en) 2009-01-22
JP2009500551A (ja) 2009-01-08

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